See the ones with the nice little circle cutout notice the <o shape. Maybe for a mic on the front. I'm just saying because why would the put a mic on the front.
Edit: is the clear case on the side that would touch the ipod or your hand I might have another point?

im pretty sure dat the ipod touch 3g will have a mic im really sure about dat but idk about the camara dats a little hard to believe,well not hard to believe but like if they put a camara its going to make it too iphonish